应变强化压力容器的稳定性研究

发布时间：2019-02-17 14:01

【摘要】：应变强化压力容器由于其轻型化等经济性优势而得到不断发展与运用,然其稳定性问题是值得探讨的问题。本文围绕应变强化压力容器的稳定性问题,分析了应变强化技术对容器内压塑性稳定性和外压稳定性的影响,并分析了带环向加强圈的应变强化压力容器的内压塑性稳定性及外压稳定性的情况。主要的研究内容和结论如下： (1)确定应变强化压力容器稳定性分析的两个表征参数：塑性极限载荷与屈曲临界载荷；选用ANSYS有限元分析软件；奥氏体不锈钢材料模型选用双线性分析模型；采用广义弧长法求解非线性方程组及增量弹塑性有限元法确定塑性极限载荷；采用特征值分析法预测结构的理论屈曲强度,即屈曲临界载荷。 (2)从理论分析、有限元数值模拟分析及实验分析三个方面分析不同预应变量对容器内压塑性稳定性的影响,均得出如下结论：预应变强化处理对容器塑性稳定性无影响。 (3)利用有限元分析不同预应变量对容器外压稳定性的影响。分析得出：预应变处理对容器外压稳定性有一定的影响,且在不同长径比下其影响存在一定区别。当长径比L/DLcr/D时,pcrc/pcr-c关系无一致规律,预应变强化处理或增强或减弱容器外压稳定性；当长径比L/DLcr/D时,pcrc/p-c呈e-Bc指数关系,预应变强化处理均消弱了容器外压稳定性。运用应变强化技术时,将长径比控制在L/DLcr/D范围内较为合理。 (4)对带有环向加强圈的应变强化压力容器稳定性情况分析。分析得出：加强圈的设置方式对应变强化压力容器的稳定性存在明显的影响。将加强圈运用于应变强化压力容器时,加强圈采用扁钢截面、等间距放置、内置于筒体内壁处及采用多道加强圈的方式较为合理。
[Abstract]:Strain strengthened pressure vessel has been continuously developed and applied because of its economic advantages such as lightness. However, its stability is a problem worthy of discussion. In this paper, the influence of strain strengthening technology on the stability of pressure vessels under strain hardening is analyzed. The internal pressure plastic stability and the external pressure stability of the pressure vessel strengthened by strain with ring stiffener ring are analyzed. The main research contents and conclusions are as follows: (1) two characterization parameters of strain-strengthened pressure vessel stability analysis are determined: plastic limit load and buckling critical load, ANSYS finite element analysis software; The model of austenitic stainless steel is bilinear, the generalized arc length method is used to solve the nonlinear equations and the incremental elastic-plastic finite element method is used to determine the plastic limit load. The eigenvalue analysis method is used to predict the theoretical buckling strength of the structure, that is, the buckling critical load. (2) from the theoretical analysis, finite element numerical simulation analysis and experimental analysis, the influence of different prestrain variables on the plastic stability of the vessel is analyzed. The conclusion is as follows: Pre-strain strengthening treatment has no effect on the plastic stability of the vessel. (3) the influence of different pre-strain variables on the external pressure stability of the vessel is analyzed by finite element method. It is concluded that prestrain treatment has a certain influence on the external pressure stability of the vessel, and there are some differences in the influence of the pre-strain treatment on the external pressure stability of the vessel under different ratio of length to diameter. When the ratio of length to diameter is L/DLcr/D, the pcrc/pcr-c relationship is not consistent, and the external pressure stability of the vessel is strengthened or weakened by prestrain strengthening treatment. When the ratio of length to diameter is L/DLcr/D, pcrc/p-c shows a e-Bc exponent relationship, and the prestrain strengthening treatment weakens the external pressure stability of the vessel. It is reasonable to control the aspect ratio in the range of L/DLcr/D when using strain strengthening technique. (4) the stability of strain-strengthened pressure vessel with circumferential stiffener ring is analyzed. It is concluded that the setting of reinforcing ring has obvious influence on the stability of strain-strengthened pressure vessel. When the stiffening ring is applied to the strain-strengthened pressure vessel, it is reasonable to use the flat steel section with equal spacing, and the reinforcing ring is built into the inner wall of the cylinder and the multi-channel stiffening ring is adopted.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH49

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